What does iron teeth fortune-telling mean? _ What does fortune-telling iron teeth mean?

What does "iron tooth" mean in Taiwanese?

Simply put, it means not believing in evil, which is usually used in aspects related to folk beliefs.

For example:

Lao Zhang often makes disrespectful behavior to the gods in the temple, and even says that he doesn't believe this. Others will advise him not to be too "iron-toothed".